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Message: [QUOTE="Rich Rohrich, post: 1208855, member: 16241"] That's what everyone says when they get the timing off on a CRF450. There are non-symmetrical timing marks on the cam sprocket that have a very specific A/B relationship with the timing marks on the crank. It's very easy to get it wrong the first time. If it's not running right it's worth rechecking the timing and the valve clearance if only to eliminate them as a possibility. The procedure for checking the compression is outlined in the service manual. [/QUOTE]